enduring legacy of the mongol invasions was the emergence of tai @ - @ shan states in mainland southeast asia . the tai @ - @ shan people who came down with the mongol invasions stayed . by the early 14th century , several tai @ - @ shan states had come to dominate a vast region from present @ - @ day assam to northern and eastern myanmar to northern and central thailand and laos . their rise was encouraged by the mongols , who viewed the states as a useful buffer between yunnan and the rest of southeast asia . the mongols , who were still trying to incorporate yunnan into the central administration , were unwilling or unable to make necessary sustained investments to bring
enduring legacy of the mongol invasions was the emergence of tai @ - @ shan states in mainland southeast asia. the tai @ - @ shan people who came down with the mongol invasions stayed. by the early 14th century, several tai @ - @ shan states had come to dominate a vast region from present @ - @ day assam to northern and eastern myanmar to northern and central thailand and laos. their rise was encouraged by the mongols, who viewed the states as a useful buffer between yunnan and the rest of southeast asia. the mongols, who were still trying to incorporate yunnan into the central administration, were unwilling or unable to make necessary sustained investments to bring